Sweat on my forehead
Sweating is an example of applying basic changes of physical state to our human experience. Sweating is the secretion of a liquid that is primarily water that forms drops on our skin to cool us down. As the sweat evaporates, the fastest moving water molecules change state from liquid to gas. This reduces the average kinetic energy in the remaining water on the skin, which means it reduces the temperature of the water. We experience this cooling effect and it helps us in hot situations. In this case, moving from country to country is stressful and thus heated and sweating is a response to combat the heat.
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